/* ==========================================================================
   Baixiang Huang — academic homepage
   Design adapted from the "Pixl" theme: DM Mono type, hard offset shadows.
   ========================================================================== */

/* Fonts ------------------------------------------------------------------- */
@font-face {
	font-family: "DM Mono";
	font-style: normal;
	font-weight: 300;
	font-display: block;
	src: url("../fonts/DMMono-Light.ttf") format("truetype");
}
@font-face {
	font-family: "DM Mono";
	font-style: italic;
	font-weight: 300;
	font-display: block;
	src: url("../fonts/DMMono-LightItalic.ttf") format("truetype");
}
@font-face {
	font-family: "DM Mono";
	font-style: normal;
	font-weight: 400;
	font-display: block;
	src: url("../fonts/DMMono-Regular.ttf") format("truetype");
}
@font-face {
	font-family: "DM Mono";
	font-style: italic;
	font-weight: 400;
	font-display: block;
	src: url("../fonts/DMMono-Italic.ttf") format("truetype");
}
@font-face {
	font-family: "DM Mono";
	font-style: normal;
	font-weight: 500;
	font-display: block;
	src: url("../fonts/DMMono-Medium.ttf") format("truetype");
}
@font-face {
	font-family: "DM Mono";
	font-style: italic;
	font-weight: 500;
	font-display: block;
	src: url("../fonts/DMMono-MediumItalic.ttf") format("truetype");
}
@font-face {
	font-family: "uni 05_53";
	font-style: normal;
	font-weight: 400;
	font-display: block;
	src: url("../fonts/uni05_53.ttf") format("truetype");
}

/* Design tokens ----------------------------------------------------------- */
:root {
	--primary: #b58863;
	--foreground: #14213d;
	--background: #f5f2ed;
	--tertiary: #ece5d9;       /* elevated surface — pill & chip backgrounds */

	--content-width: 1200px;
	--outer: clamp(0.625rem, calc(0.625rem + ((1vw - 0.48rem) * 1.2019)), 1.25rem);
	--gap: min(30px, 5vw);

	/* Hard offset "outlined" shadow that gives the header its boxed look. */
	--shadow: 5px 5px 0 -2px var(--background), 5px 5px var(--foreground);
	--shadow-sm: 3px 3px 0 -1px var(--background), 3px 3px var(--foreground);
}

/* Base -------------------------------------------------------------------- */
*,
*::before,
*::after {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
}

:focus-visible {
	outline: 2px solid var(--primary);
	outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	*,
	*::before,
	*::after {
		transition: none !important;
		animation: none !important;
	}
}

body {
	margin: 0;
	background-color: var(--background);
	color: var(--foreground);
	font-family: "DM Mono", monospace;
	font-size: 0.875rem;
	font-weight: 300;
	line-height: 1.6;
}

img {
	max-width: 100%;
	height: auto;
}

a {
	color: var(--primary);
	text-decoration: underline;
	text-underline-offset: 0.3em;
}

a:hover,
a:focus {
	text-decoration: underline dotted;
}

h1,
h2,
h3,
h4,
h5,
h6 {
	font-weight: 500;
	letter-spacing: 0.05em;
	line-height: 1.2;
}

h2 {
	font-size: clamp(1.25rem, 1.13rem + 0.24vw, 1.375rem);
	margin-top: calc(var(--gap) * 1.5);
}

h3 {
	font-size: clamp(1.125rem, 1.01rem + 0.24vw, 1.25rem);
}

mark {
	background: none;
	color: inherit;
}

/* Layout ------------------------------------------------------------------ */
.container {
	max-width: var(--content-width);
	margin-inline: auto;
	padding-inline: var(--outer);
}

/* Skip link --------------------------------------------------------------- */
.skip-link {
	position: absolute;
	left: -9999px;
	top: 0;
}

.skip-link:focus {
	left: var(--outer);
	top: 0.5rem;
	z-index: 20;
	background: var(--foreground);
	color: var(--background);
	padding: 0.5rem 0.75rem;
	text-decoration: none;
}

/* Header ------------------------------------------------------------------ */
.site-header {
	position: sticky;
	top: 0;
	z-index: 10;
	background: var(--background);
	padding-top: var(--outer);
	padding-bottom: 0.5rem;
}

.header-bar {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: 0.75rem 1.5rem;
	padding: 0.67rem;
	border: 2px solid var(--foreground);
	box-shadow: var(--shadow);
}

.site-title {
	margin: 0;
	font-family: "uni 05_53", monospace;
	font-size: 0.875rem;
	font-weight: 400;
	letter-spacing: normal;
	text-transform: uppercase;
}

.site-title a {
	color: inherit;
	text-decoration: none;
}

.site-nav {
	display: flex;
	flex-wrap: wrap;
	gap: 1rem;
}

.site-nav a {
	color: var(--foreground);
	text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus {
	text-decoration: underline dotted;
	text-underline-offset: 0.3em;
}

/* Main -------------------------------------------------------------------- */
main {
	padding-top: 3.5rem;
	padding-bottom: 3rem;
}

main a:hover,
main a:focus {
	color: var(--foreground);
}

section {
	scroll-margin-top: 5rem;
}

section + section {
	margin-top: 0.5rem;
}

/* About ------------------------------------------------------------------- */
.about {
	display: grid;
	grid-template-columns: clamp(120px, 16%, 170px) auto;
	gap: var(--gap);
	align-items: start;
}

.about .portrait {
	width: 100%;
}

.about p:first-child {
	margin-top: 0;
}

/* Social chips ------------------------------------------------------------ */
.social {
	display: flex;
	flex-wrap: wrap;
	gap: 0.5rem;
	margin-top: 1.5rem;
}

.social a {
	text-decoration: none;
	padding: 0.2rem 0.6rem;
	border: 1.5px solid var(--foreground);
	background: var(--tertiary);
	color: var(--foreground);
	transition: box-shadow 0.15s ease, color 0.15s ease;
}

.social a:hover,
.social a:focus {
	box-shadow: var(--shadow-sm);
	color: var(--primary);
}

/* Publications ------------------------------------------------------------ */
.pub-list {
	list-style: none;
	margin: 0;
	padding: 0;
}

.pub-list li {
	margin-bottom: 0.85rem;
}

/* Always-visible row: title + venue badge side by side. */
.pub-head {
	display: flex;
	flex-wrap: wrap;
	align-items: baseline;
	gap: 0.4rem 0.6rem;
}

.pub-title {
	font-weight: 500;
	line-height: 1.3;
	transition: color 0.15s ease;
}

.me {
	color: var(--primary);
	font-weight: 500;
}

/* Venue badge — reuses the offset-shadow motif at a smaller scale. */
.pub-list em {
	flex: none;
	font-style: normal;
	font-size: 0.75rem;
	font-weight: 500;
	padding: 0.05rem 0.4rem;
	background: var(--tertiary);
	border: 1.5px solid var(--foreground);
	box-shadow: var(--shadow-sm);
}

/* Authors + links: hidden until the entry is hovered or focused.
   The 0fr -> 1fr grid animates to the exact content height. */
.pub-meta {
	display: grid;
	grid-template-rows: 0fr;
	opacity: 0;
	transition: grid-template-rows 0.25s ease, opacity 0.2s ease;
}

.pub-meta-inner {
	overflow: hidden;
}

@media (hover: hover) {
	.pub-list li:hover .pub-meta,
	.pub-list li:focus-within .pub-meta {
		grid-template-rows: 1fr;
		opacity: 1;
		margin-top: 0.35rem;
	}

	.pub-list li:hover .pub-title,
	.pub-list li:focus-within .pub-title {
		color: var(--primary);
	}
}

/* Touch / no-hover devices can't hover — keep everything visible. */
@media (hover: none) {
	.pub-meta {
		grid-template-rows: 1fr;
		opacity: 1;
		margin-top: 0.35rem;
	}
}

.note {
	margin-top: 1.5rem;
}

/* Link lists (Tools, Blog) ------------------------------------------------ */
.link-list {
	list-style: none;
	margin: 0;
	padding: 0;
}

.link-list li {
	position: relative;
	margin-bottom: 0.6rem;
	padding-left: 1.1rem;
}

.link-list li::before {
	content: "\2192";
	position: absolute;
	left: 0;
	color: var(--primary);
}

/* Footer ------------------------------------------------------------------ */
.site-footer {
	padding: 2.25rem 0;
	text-align: center;
	font-size: 0.813rem;
}

/* Responsive -------------------------------------------------------------- */
@media (max-width: 640px) {
	.about {
		grid-template-columns: 1fr;
	}

	.about .portrait {
		width: 40%;
	}
}